Question

the mass of pendulum bob is 100 grams and the string is one metre long. The bob is held so that the string is horizontal and it is allowed to fall. The kinetic energy of the bob, when the string makes an angle of 30degree with the vertical is

Answer 1

As only gravitational force is acting hence, loss in Potential Energy should be gain in Kinetic Energy.

2

1

​

mu

2

=mgh

KE=0.1×10×cos30

0

KE=

2

3

​

​

J